The command du «summarizes disk usage of each FILE, recursively for directories,» e.g.,

du -hs /path/to/directory

• -h is to get the numbers «human readable», e.g. get 140M instead of 143260 (size in KBytes)
• -s is for summary (otherwise you’ll get not only the size of the folder but also for everything in the folder separately)

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As you’re using -h you can sort the human readable values using

du -h | sort -h

The -h flag on sort will consider «Human Readable» size values.

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If want to avoid recursively listing all files and directories, you can supply the --max-depth parameter to limit how many items are displayed. Most commonly, --max-depth=1

du -h --max-depth=1 /path/to/directory